为什么没有结果显示求助求助

请直接复制代码，你这样发图片，别人不好弄啊，朋友。

sorry
#include<stdio.h>
int main()
{
    int letter(char);
    int dight(char);
    int space(char);
    char str[100];
    gets_s(str,100);
    int m, n, z;
    m = letter(str[100]);
    n = dight(str[100]);
    z = space(str[100]);
printf("letter=%d,dight=%d,space=%d", m, n, z);
return 0;

}
int letter(char)
{
    char str[100];
    gets_s(str,100);
    int i = 0,count = 0;
    while (str[i] != '\0')
    {
        if ((str[i] >= 65 && str[i] <= 90) || (str[i] >= 97 && str[i] <= 122))
        {
            count++;
        }
        i++;
    }
    return count;
}
int dight(char)
{
    char str[100];
    gets_s(str, 100);
    int i = 0, count = 0;
    while (str[i] != '\0')
    {
        if (str[i] >= 48&&str[i]<=57)
        {
            count++;
        }

        i++;
    }
    return count;
}


int space(char)
{
    char str[100];
    gets_s(str, 100);
    int i = 0, count = 0;
    while (str[i] != '\0')
    {
        if (str[i] == 32)
        {
            count++;
        }

        i++;
    }
    return count;
}

申明函数不是应该在main函数之前吗
你这样不需要传递形参 ，定义全局变量吧
#include<stdio.h>
#include <stdlib.h>
char str[100];
int i = 0,count = 0;
int letter(void);
int dight(void);
int space(void);
int main()
{
   
    gets(str);
    int m, n, z;
    m = letter();
    n = dight();
    z = space();
    printf("letter=%d,dight=%d,space=%d", m, n, z);
    return 0;
  }
int letter(void)
{
    int i = 0,count = 0;
    while (str[i] != '\0')
    {
        if ((str[i] >= 65 && str[i] <= 90) || (str[i] >= 97 && str[i] <= 122))
        {
            count++;
        }
        i++;
    }
    return count;
}
int dight(void)
{
     i = 0, count = 0;
    while (str[i] != '\0')
    {
        if (str[i] >= 48&&str[i]<=57)
        {
            count++;
        }

        i++;
    }
    return count;
}


int space(void)
{
     i = 0, count = 0;
    while (str[i] != '\0')
    {
        if (str[i] == 32)
        {
            count++;
        }

        i++;
    }
    return count;
}

[此贴子已经被作者于2018-5-8 23:08编辑过]

#include<stdio.h>
int letter(char *);
int dight(char *);
int space(char *);
int main()
{
    char str[100];
    gets(str);
    int m=0, n=0, z=0;
    m = letter(str);
   n = dight(str);
  z = space(str);
printf("letter=%d,dight=%d,space=%d", m, n, z);
return 0;

}
int letter(char *str)
{
    int i = 0,count = 0;
    while (str[i])
    {
        if ((str[i] >= 65 && str[i] <= 90) || (str[i] >= 97 && str[i] <= 122))
            count++;
       i++;
    }
    return count;
}
int dight(char  *str)
{
    int i = 0, count = 0;
    while (str[i])
    {
        if (str[i] >= 48&&str[i]<=57)
        
            count++;
        

        i++;
    }
    return count;
}


int space(char  *str)
{
    int i = 0, count = 0;
    while (str[i])
    {
        if (str[i] == 32)
        
            count++;
        

        i++;
    }
    return count;

[此贴子已经被作者于2018-5-8 22:57编辑过]